Machine for facing tapered workshop elements of varying tapers and widths



5 Sheets-Sheet 1 E. DAVIES OF VARYING TAPERS AND WIDTHS ZMM MACHINE FORFACING TPERED WORKSHOP ELEMENTS Sept. 4, 1951 Filed Feb. 12, 1948 Sept.4, 1951 T. E. DAvlEs MACHINE FOR FACING TAPERED WORKSHOP ELEMENTS 0FVARYING TAPERS AND WIDTHS 5 Sheets-Sheet 2 Filed Feb. l2. 1948 Sept- 4,1951 T. E. DAvlEs 2,566,697

MACHINE FOR F'ACING TAPERED WORKSHOP ELEMENTS OF' VARYING TAPERS ANDWIDTHS Filed Feb. l2, 1948 5 Shf-:OtS-'Sheet 3 zml QW Sept. 4, 1951 fr.E. DAvlEs MACHINE FOR FACING TAPERED WORKSHOP ELEMENTS 0F VARYING TAPERSAND wInTHs 5 Sheets-Sheet 4 Filed Feb. 12, 1948 E. DAvlEs 2,566,697

5 Shcets-Sheet 5 OF' VARYING TAPERS AND WIDTHS Sept. 4, 1951 MACHINE FORFACING TAPERED WORKSHOP ELEMENTS Filed Feb. l2. 1948 mvo.

Patented Sept. 4, 1.951

MACHINE YFOR FACING TAPERED WQRK- SHOP ELEMENTS F VARYING TAPERS ANDWIDTHS Thomas Ellis Davies, Birmingham, England, as-

signor -to Dunlop Rubber .Company Limited, London, England, a Britishcompany Application February 12, 1948, SerialNo. 7,836 In Great BritainJ anuary 21, 1947 Section 1, Public Law 69.0, August 8, 1946 'Patentexpires January 2 1 1 967 Claims.

This invention provides a machine for facing thediverging sides o ftapered workshop elements :of `rvarying tapers and varying widths, and.more particularly for facing the diverging sides of tapared Lsegmentswhich are subsequently assem- ,bled and .fixed -sideby-side incr-1e halfof a mould for a "rubber tyre, to provide the ,pattern of `said 'mould.

Tapered workshop elements, Iincluding ,segrments for moulds -of diierentsizes ,and having different patterns, necessarily vary considerably i-in`taper and with and it is .the object of -this invention to Aprovide Lacomparatively compactmachine which can be readily adjusted -to `face aYrange of :elements or segments.

According tothe invention a-machine `forfacing 'the diverging sides ,citapered work-shop .ele-

ments-of varying tapers and varying widths comprises :a frame,.1a-member .adapted to be ,angularly adjusted v a predetermined amount:relative to the iframe :and laterally displaced a kpredetermineddistance relative to the :main axis :of the trame.

a slide :mounted on the said member, rotatable .cutter means mounted :onthe said slide, drving .means for the said rotatable cutter means, -anzdKdriving means for the ,sa-id slide, such driving means being operativevfor any angular position .and any lateral displacement ,of the y saidmember witni'nrthe predetermined ranges.

Preferably according to the invention ,a 4ma- ;chine for simultaneouslyfacing the divergging sides pf tapered workshop elements :oi yar-yingltapers and --varying widths comprises .1a iframe, a imem'beroneach-side of .the main axisof thefsai-d frame fadapted to .beangularly :adjusted .a :prede- 1 termi-ned amount relative tothe :frame4and :laterally displaced `a predetermined ldistancezrelative to Isaidmain raxis, a :slide mounted #on each o'f v the said members, Arotatablecutter-means'mounted on each 'of Athe said slides-driVingmeans dereachof `the said rotatable cutter means, Tand v'driving means for the-said slides, such `driving means -being operative for any angularposition -and :any

lateral displacement Yof "the said 'members Vwithin 2 tions .attainedprior to the machining operation on the segment.

Fig. 2 isa part sectional plan of Figl.

Fig. 3 is sectional side elevation on an enlarged scale and taken on thedotted linesX-X of Fig. 2.

Fig. 4 is a part sectional side View of the .alter- .native form ofmachine, the parts of which are in positions attained prior to themachining opera.- tion -on the segment.

Fig. 5 is a fragmentary plan of Fig. 4 showing, for convenience, onlyone slide and its Aassociated mechanism in full.

Referring to Figs. l to 3 the segment I is rigidly hel-d ina support 2so that its divergingsides 3 can bemachinedby rotary cutter heads 4adapted ,to be traversed relatively to said segment.

The machine comprises a frame consisting of two spaced-apart legs -54and a rectangular bed 6 resting on and bolted to said legs. The upperfac-e of the bed is planed and has a central tenon slot 1 on .the mainaxis A- B of themachine, and two .T- slots 8 which extend parallelwith'and .one leach side of the tenon slot, said I'-slots being engagedby T-bolts carried by the segment support '2 to secure said supportrigidly `to the bed in any suitable position along the main axis. The'S1113- 4port has vice jaws to grip the segment said jaws being operableby a. lever 9 and push rod 'I0 from -hand operated toggle means (notshown), also vsaid support has fine adjustment means I I for thepurposehereinafter referred to.

On one side of the `main axis the mechanism is )substantially a replicaof the mechanism on the other side of the axis so that as far aspossible one side only -is vhereinafterdescribed as being`representative of both.

.The rotary cutter head 4 is mounted on a horizontal spindle I2supported in suitable bearings in a housing I3 said spindle being drivenby belt means I 4 yfrom an electric motor I 5. The spindle housing .andelectric motor form part of aslide I6 which can be horizontallytraversed in a substantially longitudinal direction of the machine on amember Il supported on the machine bed in `a movable manner, said slidehavinga nut I8 which Vengages Aa lead screw `I9 mounted intapered rollerbearings located in the ends of vthe member.

The member at its one end has two arms 20 and 2-I through which passesandissecured by a drive-nt, a vertical sleeve 22 whosel-ower endprojectsslightly below the lower face of the arm 2| to form a register forabearing washer 23 located between said lower face and a machined upperfacelof a base 24 `which formspart Vof ya boxelike 3 cover 25 bolted ina fixed position to the head end of the machine bed, said cover having aremovable top plate 26 for a purpose to vbe hereinafter described.

Three vertically disposed bushes 21, only one of which is shown in Fig.3 and another indicated in Fig. 2, pass through openings, the base 'ofthe cover and the machine bed, against the underside of which a shoulder28 on each of the bushes abuts, said bushes being equally spaced aparton a transverse axis of the machine and being grouped on one side of themain axis. A plug 29 has a nut formation 3G at its upper end and ashoulder 3l which bears against the upper end of the sleeve and saidplug passes through the bore of said sleeve and makes a good slide-ntengagement therewith, and at its lower end passes into and engages witha good slide-fit the bore of any pre-selected plug bush. The bores ofthe bushes are screw-threaded at their lower ends to co-operate with thescrew-threaded lower end 3Ia of the plug. The one end of the member istherefore anchored t'o the bed in a manner allowiiig'for rits adjustmentin a horizontal plane both angularly, and, according to which bush isengaged, also laterally.

One end of the lead screw projects between the two arms of the memberand to this end is rigidly secured a driven bevel wheel 32 meshing witha driving bevel wheel 33 secured concentrically to a worm wheel 34 toform a unit which is rotatably mounted on a bearing bush 35 secured by adrive-fit to the exterior of the sleeve. To locate the unit againstaxial movement its lower face bears against a thrust washer 36 whichabuts against the upper face of the arm 2l, while the upper face of saidunit bears against a shoulder 3i formed on the bearing bush.

Disposed transversely of the machine in a horizontal plane is a wormshaft 38 supported in suitable bearings in the cover, said shaft beingformed with two worm portions 39 disposed equally one each side the mainaxis 'and each engaged by one of the worm wheels 34, each portion beingsufficiently long to allow of adjustment of the vposition of the wormwheel as described below.

The worm shaft I8 is driven by belt means from an' electric motor 4Uthrough any suitable motion transmitting means 41 such that the shaftcan be rotated in either direction and preferably at different speedsVsaid means being coupled to a manually operable control lever 45 by arod 45. 2"he'cover 25 substantially encloses the arms at the end of thetable, bevel gears, worm wheel and worm, so that an oil bath for thegearing is pro.- vided, a dished plate 4I being applied to the undersideof the bed adjacent the bushes to prevent egress of oil through thebushes not being used.

Rigidly secured to the end of each member remote'from the arms is avertically disposed circular setting stud 42, and the bed, at this tailend y' and on each side of the xed axis, is provided with three holes 43corresponding to the three bushes 21 and in similar relationship to themain axis as said bushes. Clamping means 44 are also provided at thisend of the bed to co-operate with and lock the member in its desiredposition.

When it is desired to set the machine to face be secured by thescrew-action. The top plate of the cover can then be replaced and Xed.During this movement of each member the respective worm wheel 34 rollsalong its associated worm portion 39, which as before described is ofsufficient length for this purpose. For each member in turn, a settingplug (not shown) is inserted into a hole 43 at the tail end of the bed,said hole corresponding in position to the bush which the plug 29engages at the head of the bed, and a slip gauge of predetermined lengthis placed against the periphery of said setting plug and the member isangularly adjusted about the plug 29 until its setting stud 42 abutsagainst the slip gauge; The respective clamp 44 is then tightened tosecure the member in its adjusted position. Dependent upon the width ofthe segment I, theslides IG carrying the cutter heads 4 are traversed tosuitable positionson their members I1, the segment support 2 is moved toan approximately correct position in relation to the cutters, and theyfine adjustment means II is then used.to move-said support in eitherdirection along the main axis the diverging sides of a segment, the topplate 26 4 of the cover 25 is removed and the screw-threaded-ends of theplugs 29 are manually withdrawn into the sleeves'22 and, with the clamps44 loosto obtain the correct position.

The machine operates as follows from the position shown in the drawings.The lever 45 is rocked to one side of its mid-position to operateswitches (not shown) whereby the motors I5 are energised to rotate thecutter heads 4. A further switch (not shown) is also simultaneouslyoperated to energise the motor 43 so that rotary motion in the desireddirection is transmitted through the means 41, which has also beenactuated by the rod 46, to rotate the lead screws I9 and effect a feedtraverse which is suitably slow. When the sides 3 have been faced bythecutter heads 4 the lever 45 is manually moved to its midposition tode-energise the motors I5 and 4I). The lever 45 is then manually movedto its other side position to again energise the motor 40 and actuatethe means 41 so that rotary motion' is transmitted through said means 41in a reverse direction at a greater speed than before to rotate the leadscrews I9 and effect a quick return traverse of the cutter heads 4. Whenthe cutter heads are clear of the support the lever is moved to itsmid-position'to de-energise the motor 40 and so stop the returntraverse, Vand the machined segment can then be removed from saidsupport.

In a further embodiment of the invention (not illustrated) each leadscrew, instead ofA having a bevel wheel mounted on its one end, isprovided with a worm wheel secured at said end, said worm-wheel meshingwith a vertically disposed worm mounted to rotate freely around a sleevesuch as before described, said worm being rigidly secured in concentricrelation to a bevel wheel which meshes with a bevel wheel splined on atransverse driving shaft tobe axially slidable thereon and allow oflateral adjustment of the member, the other features of the machinebeing in main substantially as described in relation to the otherembodiment. Y

Referring to Figs. 4 and 5 the segment 50 having divergingsides 52 isrigidly held by vice jaws provided in a support 5I, said jawsbeing'operable by a lever IUI and push rod |02 from hand operated togglemeans (not shown).A 'Fineadjustment means ID3 arev also provided onthe'support for a purpose' hereinafter referredto.

The machine comprises a frameA havig'a horizontal bed 54 mounted onsuitablejlegs and .the upper face of said bed is planed and'has'aVcentral-tenon slot 55 VonV the main axisV C-D'bf the machine, v'and"two Ts'lots 566 which vextend parallel Withandoneeach side of thetenori slot1 said T-slots being used -for securing the segment 'supportto thewbed at'anysuit'able position along the main axis "'On' one YsideJof the `nfiain axis the mechanism -`is in part 'a replica 'of themechanism on Athe other Side "of the vaxis :so that as lfar as possible-One side only `is ldescribed Ias being representative -of both.

A rotatable -cutter head -v5`3 -is mounted fon -a horizontal spindle |00supported in suitable `bear-- y ings inupright arms 5511,*saidspndlefbeingfdrivyen jby 'an 'electric =motor 56e `v`as "hereinafterdescribed. lThe Y'upright rarms form #part "of fa fslid'e 51 o'n Iwhich'said motor "is -`mounted, said slide Ybeing mounted on a `member v5Bsupported on the machine bed in a'movable manner, ithe spindle `l 00'-b'eing disposedftransversely of fthe direction-of movement of saidslide. A driving pinion ,'59 V'is keyed 4to -the rnoto'r shaft andfrneshes with' an intermediate pinion 760 directly coupled vto `a co--axial'pulley'i 'engage'd'by a belt 6'2 also :passing around 'a `'pulley'l5-3 ykeyed to the spindle 100. Meshing with the intermediate'lpinionB'n'is a drivenspur wheelf'dkeyedl'toia shaft '65 mounted-in bearingsinthe slide, vand on 'said-shaftis'ffo'rmed Va worm-66 engaging with-aWorm-wheel vil'which constitutes a nutaxially supportedbyisaid slide andengaging a I'leacl-f'scr'evv68. Said "spur wheel and pinions aresuit-ably ienclosed in 'a casing =(not shown). Thelead screw rissupported by the nut and byeJ bea`ringl6'9- securedtothe member. In'order Vto take up any slack which de- 'velops inthe rbelt 56'2 -themotor "56a 'is Yadjustable 'onfthe slide 51 land the intermediateIpinion 69 'issupported by "a pedestal 'i adjustable in an arcuatepath-aroundthe axis @of the driven spur wheel 64 andsecuredtothe'slidelin its adjusted position by v"bolts `Tl.

YTo one end ofthelea'd-'screw is'fkeyed a toothed bevel wheel 12whichmeshes'with a bevel wheel Y'|3` keyed to a Vertical "stub 'Shaftv114fdispbseciion one'side of the m'ainlaxi's and-supported by the 'bedatits lower end'and supported fatits upper end'by an upstanding bracket'215 secured to the upper Yface of-said bed.`.Interimedi'ate'itsendspthe stub 'shaft passesltliroughlthe member".iin-a manner allowing said member to be 'angularly adjusted aroundsaid stbshaft.

vFrom the foregoing description -it should-be appreciated 'that'thereare two' stub shafts 14 one each side the m'ain'axis. T'One 'o'frsaid-"stub-'shafts has a driven gear wheel 16 securedfthereto so that-said stub-shaft;v drivenpinion,fandfthefassociated bevel wheel vrotateyas a one-piece part. I Ihe other stub-shaft has `freely mounted`thereon -a driven gear wheel 'l1-providedv on its-'upper '-'iace withldog teeth adapted to engage, except '.-when hereafter stated,corresponding teeth formed on a 'collar 'lthereby -to forma clutch T9between said driven gear wheel Hand-collar 18. The bore of 'thecollar'is'of square cross-section-'-and slidably engages `a squared lend89V f 'the stubshaft to provide la driving f-engagernent, saidcollarbeing formed initsperiphery with an annular groove 8| engaged by abifurcated lever 82 adapted to berocke'd about its fulcrum 83 by a link85 from a treadle mechanism (not shown) to operate said dog clutch.Mid-way between the two stub-shafts .coincident with .the =main axis, isdisposed a driving gear wheel 86 disposed above the bed and keyed to avertically disposedy driving shaft 81 "supported in' a bracket "-88iixe'd `to the bed, said shaft passing through the bed andbeing-'coupled by'sp'iifalgears 89 to afs'haft @driven by an electricmotor Cnet-shown) located -under neath I'said bed. Disposed 'above lthevrbed and mounted l'to recklabout Lthe vertical driving shaft is acarrier Varm -9l having two idler wheels :92 "mounted thereon, saididler 'wheels being f-diametrically opposite Jeach lother with respect-to the lairis of fthe arm Land each being 'in constant mesh with 5thedriving A'gear swhee'le. The idler :wheels192 are-'adapted-tobe swunginto and out lof engagement with the driven gear vwheels T6 zand l1-*1ffor a p'urpose tobe 'hereinafter described by rocking ithe arm aboutits y-axis Thelstu'b-shaftsaredisposed at'what will be 'termedlthel'head fend of lthe machine and vat 4said 'head end, -on eachfsid'eY'o'f the 4Lmain .axis, there fare `provided-two vertical 'holes 93 in-the machine bed said holes being spaced -apart kon Ya traverse axis #ofLt'he machine, and the :appropriate stubfshaft is rotatably secured v.ineither of 4the said iholes. v'Each member 58 'is therefore an- -ch'ored.fat "-itsnn'e fend tothe head 'vend of the :bed .in va .manner allowingfor its :adjustment :in va horizontal plane both angularly,.and,according :to'whichirholes fis engaged by Ltherespective lstu'bshaft,:also ilaterally. :At 'ithe :tail end of the machine the bed is.zprovidedzon each :.side tof the maintaxis, .with two .verticaliholes.9.4v corresponding in transverse lposition with the two 'holes .93 atthe head end of the machine-onathesameside -of themain axis. The aendfof,each member -remote from itsfanchorageis;,provided with a ver `tical-hole adapted-to receive a-'setting plug y(notshown), andfclampingmeans98 are located at this end ofthe bed :to y.co-operate vwith andlock themember in itsrequiredfposition.

When it is desired to set the machine to face the diverging sides-lofasegment Athe brackets 15, carrying the stub-shafts 'I-4 ,ar.e.bolted tothe bed 54 in VApositionssuch .that said. stub-shafts engage the correctVholes .93 in said bed. vIf the stubsha'Sts'M are engaged ywiththeholes93 nearest the main axis vthe driven gear wheels 7.6 and 'Il 'meshdirectly withtheldrivinggear `wheel 85,. and

the idler wheels "92 are disengaged from vsaid driven geanwhe'elsby'moving the carrier arm 98| about its axis. If the stub shafts areengaged `with'the Thole's 'remoteirom the main axis the driven 4gear'Wheels T6 'and 11 are disengaged Afrom the Idriving )gear wheel and"the arm is v-moved aboutits'axis .so'that"the lidler wheels 92 mesh"also with "the "said driven rgear wheels "I5 o A-ariid 'I'ltotransmitmotionfr'om"the said driving 7lgear-wheel. The-'carrier'arrnSIismaintained in of 'two Iholes "Q8 inthe arm, said bolt, being mountedinthefbracketf' to 'slide in 'a vertical Vdirectionwhen'a'ctuatedby'a'handle 99 attached v-to fsaidbolt v*For eachitableinturn, va setting' pluginet-shown) is inserted into 'alhole 9'4 at thetailfendof the 'bed, saidliole corresponding in adjustment-'theassociatedbevel 'wheels roll one over'the other. The'respectiveclampingmeans Vare I' then Itightened to'secure the members in 1 theiradjusted positions.

Dependent upon the v-vv1dth-r of *the ifsegment, "the :fslides "carryingthe :critter'fheadsare traversed tof"suitable^'pcsiticns on theirmembers ,a manner as hereinafter described, the segment support is movedto an approximately correct position in relation to the cutter heads,and the fine adjustment is then used to move said support in eitherdirection along the main axis to obtain the correct position relative tothe cutter heads.

YThe operation of the machine is controlled by manually operableswitches (not shown), one of which controls the two electric motors 56aeach adapted to rotate a cutter head 53 and a nut 61, Another switchcontrols the motor adapted to rotate the lead screws B8, and a reversingswitch is also connected to said motor in order that the lead screws canbe rotated in the required direction irrespective of whether or not theidler wheels 92 are used to transmit motion from said motor to said leadscrews.

It should be appreciated that during operation of the machine the twomotors which rotate the cutter heads 53 also rotate the nuts aroundtheir respective stationary lead screws to traverse the slides 51 andcutter heads along their respective tables 54 at a suitable cuttingfeed. The return traverse of the slides and cutter heads is effected ata relatively increased speed by switching oil' the motors 56a andswitching on the motor to rotate the lead screws in .their respectivenuts which are prevented from rotation by the stationary worms 66.

As the cutter heads are traversed during the feed motion by the twoindependent motors 56, it is probablethat after a period of use the onecutter head becomes slightly advanced along its member relatively to theother cutter head on its member owing to the two motors running atspeeds which differ infinitesimally. In order to re-position the cutterheads correctly the dog clutch 19 is disengaged and the motor adapted torotate the lead screws is switched on in the 'desired direction therebyto rotate one lead screw and traverse the respective cutter head therequisite distance necessary for correct positioning relative to theother cutter head.

Having described my invention, what I claim 1. A machine forsimultaneously facing the diverging sides of tapered workshop elementsof A varying tapers and varying widths comprising a4 frame, a supportfor said elements attached to said frame with its axis coinciding .withthe main axis of the frame, a member on each side of said main axis,each said member being angularly adjustable and laterally displaceablerelative to said axis, a slide mounted on each of said members, a screwmeans associated with each slide, a lead screw carried on eachV memberand engaging with its respective screw means whereby on relativerotation of said screw and screw means each said slide is traversedalong said screw, rotatable cutter means mounted on each of said slides,driving means for each of said cutter means and driving meansfor saidlead screws, a common motive power for said driving means, such meansbeing operative in any angular position and lateral displacement of themembers within a predetermined range, the driving means for the leadscrews comprising a worm shaft having two worm portions, one portion foreach lead screw, and driven by the source of motive power, worm wheelsone for each portion of said worm shaft and driven thereby and pairs ofbevel wheels one pair for each said worm wheel and meshing therewith,one bevel wheel beingr set of holes for selective engagement by eachplug, said holes being spaced apart on an axis parallel to the axis ofthe said worm shaft so that the worm wheels gear correctly with the wormshaft in any position of the said plugs, and the frame has correspondingholes at the ends of the adjustable members remote from the said plugholes. 1

4. A machine. for simultaneously facing the diverging sides of taperedworkshop elements of varying tapers and varying widths comprising aframe,y a support for said elements attached to said frame with its axiscoinciding with the main axis of the frame, a member on each side ofsaid main axis, each said member being angularly adjustablev andlaterally displaceable relative to said axis, a slide mounted on each ofsaid members, a screw means associated with each slide, a lead screwcarried on each member and engaging with its respective screw meanswhereby on relative rotation of said screw and screw means each saidslide is traversed along said screw, rotatable cutter means mounted oneach of said slides, driving means for each of `said cutter means anddriving means for said lead screws, a common motive power for saiddriving means, suchvmeans being operative in any angular position andlateral displacement of the members within a predetermined range, thedriving means for the lead screws comprising a driving gear wheel drivenfrom the source of motive power, a carrier arm rotatably mounted aboutthe axis of said gear wheel and carrying a pair of idler wheels inconstant mesh therewith, a pair.of stub` shafts each carrying a drivengear wheel adapted to mesh with an idler wheel or with said driving gearwheel, and a pair of intermeshing bevel wheels associated with eachdriven gear wheel, one bevel wheel being co-axial with and driven by thesaid driven gear wheel and the other bevel wheel being co-axial with anddriving a lead screw. Y

5. A machine as claimed in claim 4 wherein each lead screw engages witha nut associated with a slide, said nut being rotatable by a worm wheeland worm shaft, the worm wheel being integral with the said nut and theworm shaft driven through gearing from an independent source of motivepower mounted on the said slide, whereby motion of the slide in onedirection is effected by rotating the lead screw relative to the nut andin the reverse direction by rotating the nut relative to the lead screw.

THOMAS ELLIS DAVIES.

REFERENCES CITED UNITED STATES PATENTS Name Date Barnes Dec. 23, 1924Number

